A5017329604- Polar Research and Ecology
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Marine and coastal plant biology
- Lichen and fungal ecology
- Biocrusts and Microbial Ecology
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Diatoms and Algae Research
- Marine Biology and Ecology Research
- Protist diversity and phylogeny
- Photosynthetic Processes and Mechanisms
- Algal biology and biofuel production
- Atmospheric chemistry and aerosols
- Food Industry and Aquatic Biology
- Isotope Analysis in Ecology
- Skin Protection and Aging
- Bryophyte Studies and Records
- Methane Hydrates and Related Phenomena
- Marine Bivalve and Aquaculture Studies
- Yeasts and Rust Fungi Studies
- Light effects on plants
- Spaceflight effects on biology
- Marine animal studies overview
Research Organization of Information and Systems
2009-2024
National Institute of Polar Research
2015-2024
The Graduate University for Advanced Studies, SOKENDAI
2014-2024
Research Research (South Africa)
2024
Niigata University
2024
EarthTech International (United States)
2024
Hudson Institute
2023
John Wiley & Sons (United States)
2023
Kitami Institute of Technology
2005
The University of Tokyo
1989-1990
Terrestrial biota in the Antarctic are more globally distinct and highly structured biogeographically than previously believed, but information on biogeographic patterns endemism freshwater communities is largely lacking. We studied of diatoms based analysis species occurrences a dataset 439 lakes spread across realm. Highly diatom floras, both terms composition richness, characterize Continental Antarctica, Maritime Antarctica sub‐Antarctic islands, with marked provincialism each region. A...
A total of 71 isolates were collected from lake sediment and soil surrounding lakes in the Skarvsnes area, Antarctica. Based on ITS region sequence similarity, these classified to 10 genera. Twenty-three categorized as ascomycetous fungi five genera (Embellisia, Phoma, Geomyces, Tetracladium or Thelebolus) 48 basidiomycetous (Mrakia, Cryptococcus, Dioszegia, Rhodotorula Leucosporidium). Thirty-five percent culturable genus Mrakia. Eighteen eight selected tested for both antifreeze activity...
The Antarctic terrestrial environment harbors a diverse community of microorganisms, which have adapted to the extreme conditions. aim this study was describe composition microbial communities in range environments (various biocrusts and soils, sands from ephemeral wetlands, biofilms, endolithic hypolithic communities) East Antarctica using both molecular morphological approaches. Amplicon sequencing 16S rRNA gene revealed dominance Chloroflexi, Cyanobacteria Firmicutes, while 18S showed...
Milk fat curdle in sewage is one of the refractory materials for active sludge treatment under low temperature conditions. For purpose solving this problem by using a bio-remediation agent, we screened Antarctic yeasts and isolated SK-4 strain from algal mat sediments Naga-ike, lake Skarvsnes, East Antarctica. The yeast showed high nucleotide sequence homologies (>99.6%) to Mrakia blollopis CBS8921(T) ITS D1/D2 sequences had two unique characteristics when applied on an sludge; i.e., it...
Accelerated glacier melt and runoff may lead to inputs of labile dissolved organic matter (DOM) downstream ecosystems stimulate the associated biogeochemical processes. However, still little is known about glacial DOM composition its processing before entering ocean, although function in food webs largely depends on composition. Here, we employ a set molecular optical techniques (UV–vis absorption fluorescence spectroscopy, 1H NMR, ultrahigh-resolution mass spectrometry) elucidate Antarctic...
Abstract Prasiola crispa , an aerial green alga, forms layered colonies under the severe terrestrial conditions of Antarctica. Since only far-red light is available at a deep layer colony, P. has evolved molecular system for photosystem II (PSII) excitation using with uphill energy transfer. However, basis underlying this remains elusive. Here, we purified light-harvesting chlorophyll (Chl)-binding protein complex from (Pc-frLHC) that excites PSII and revealed its ring-shaped structure...
Identifying drivers of the molecular composition dissolved organic matter (DOM) is essential to understand global carbon cycle, but an unambiguous interpretation observed patterns challenging due presence confounding factors that affect DOM composition. Here, we show, by combining ultrahigh-resolution mass spectrometry and nuclear magnetic resonance spectroscopy, varies considerably among 43 lakes in East Antarctica are isolated from terrestrial inputs human influence. The these primarily...
This is the first estimation of methane efflux from bubbles in lake ice Antarctica. Bubbles suspended shallow 20 lakes were observed as part operations 45th Japanese Antarctic Research Expedition ice‐free rocky areas along eastern coast Lützow‐Holm Bay (Syowa Oasis) East Antarctica 2004. Anomalous concentrations and anomalous dissolved water frequently found. Methane varied 5 orders magnitude, 1.9 ppmv to 18% vol/vol. A procedure that makes estimations flux possible has been developed, on...
The terrestrial cyanobacterium Nostoc commune Vaucher ex Bornet et Flahault occurs worldwide, including in Japan and on the Antarctic continent. green alga Prasiola crispa (Lightf.) Kütz. is also distributed Antarctica. These two species need to acclimate severe climate low ambient temperature desiccation under strong light conditions. To clarify this acclimation process, physiological characteristics of photosynthetic systems these organisms were assessed. relative rate electron flow N....
Abstract Polar lakes respond quickly to climate-induced environmental changes. We studied the chemical limnological variability in 127 and ponds from eight ice-free regions along East Antarctic coastline, compared repeat specific conductance measurements Larsemann Hills Skarvsnes covering periods 1987–2009 1997–2008, respectively. Specific conductance, concentration of major ions, pH nutrients underlie variation limnology between within regions. This is probably related differences time...
ABSTRACT Parasitic fungi infected an Asterionella formosa Hass. population for 10 months of the year, during which time density alga was over 100 cells‐L −1 . High injection rates more than 20% cells were observed between February and July except on a few occasions such as late April June. Mortality diatom temperature dependent in dialysis tube culture experiments; loss rate field populations due to fungal also affected by temperature. Loss negligibly small m even though infection...
Waterborne pathogenic diseases are public health issues, especially for people staying in remote environments, such as Antarctica. After repeated detection of Legionella by PCR from the shower room Syowa Station, Japanese Antarctic research station, we wanted to understand occurrence waterborne pathogens, Legionella, station and their potential sources. In this study, analyzed water biofilm samples collected facilities well surrounding glacier lakes, 16S rRNA gene-based amplicon sequencing....
Prasiola crispa , an aerial green alga, exhibits remarkable adaptability to the extreme conditions of Antarctica by forming layered colonies capable utilizing far-red light for photosynthesis. Despite a recent report on structure P. ’s unique light-harvesting chlorophyll (Chl)-binding protein complex (Pc-frLHC), which facilitates absorption and uphill excitation energy transfer photosystem II, specific genes encoding subunits Pc-frLHC have not yet been identified. Here, we draft genome...